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May 21st, 2026 :: 4:54 am CDT   

Local Weather Report for
Decatur
Illinois, United States

 Current Decatur Weather Conditions Updated May 21st at 3:54 am 
Overcast
Temperature:46°F Dew Point:39°F
Barometer:30.18 inHg Wind:calm
Humidity:75.8% Visibility:0M
 
 Decatur Weather Forecast Summary  
 
Today
May 21st
Friday
May 22nd
Saturday
May 23rd
Sunday
May 24th
Monday
May 25th
Mix of Sun and Cloud Cloudy Mix of Cloud and Sun Mix of Cloud and Sun Mix of Cloud and Sun
60°F
66°F
54°F
72°F
59°F
77°F
63°F
73°F
64°F
 
 Decatur Detailed Weather Forecast  
 
Thursday, May 21st, 2026
Morning Temperature: 56°F
Sunny with cloudy periods. Windy.
Afternoon Temperature: 55°F
A mix of cloud and sun. Windy at times.
Evening Temperature: 57°F
A mix of cloudy and clear skies. Windy at times.
Friday, May 22nd, 2026
Overnight Temperature: 55°F
Cloudy. Windy at times.
Morning Temperature: 57°F
Cloudy. Windy at times.
Afternoon Temperature: 64°F
Cloudy with a slight chance of showers. Windy at times.
Evening Temperature: 61°F
Mostly cloudy. Windy at times.
Saturday, May 23rd, 2026
Overnight Temperature: 60°F
Cloudy.
Morning Temperature: 61°F
A mix of cloud and sun.
Afternoon Temperature: 69°F
A mix of cloud and sun.
Evening Temperature: 66°F
A mix of cloudy and clear skies.
Sunday, May 24th, 2026
Overnight Temperature: 63°F
A mix of cloudy and clear skies.
Morning Temperature: 67°F
Mostly cloudy.
Afternoon Temperature: 75°F
A mix of sun and cloud.
Evening Temperature: 71°F
Mostly clear. Slight chance of a thunderstorm.
Monday, May 25th, 2026
Overnight Temperature: 65°F
Mostly clear.
Morning Temperature: 69°F
A mix of sun and cloud with a chance of showers. Slight chance of a thunderstorm. Windy at times.
Afternoon Temperature: 72°F
Mostly cloudy with a chance of showers. Slight chance of a thunderstorm. Windy at times.
Evening Temperature: 67°F
A mix of clear and cloudy skies.
Tuesday, May 26th, 2026
Overnight Temperature: 65°F
Cloudy.
Morning Temperature: 67°F
Cloudy. Windy at times.
Afternoon Temperature: 72°F
Cloudy with a slight chance of showers. Windy at times.
Evening Temperature: 68°F
A mix of cloudy and clear skies.
Wednesday, May 27th, 2026
Overnight Temperature: 65°F
Clear with cloudy periods.
Morning Temperature: 70°F
Cloudy. Slight chance of a thunderstorm. Windy at times.
Afternoon Temperature: 78°F
A mix of cloud and sun with a chance of showers or thundershowers. Windy at times.
Evening Temperature: 73°F
Clear with a chance of showers or thundershowers. Windy at times.
Thursday, May 28th, 2026
Overnight Temperature: 68°F
Mostly clear with a chance of showers. Slight chance of a thunderstorm.
Morning Temperature: 74°F
Sunny with a chance of showers or thundershowers. Windy at times.
Afternoon Temperature: 82°F
A mix of cloud and sun with a chance of showers or thundershowers. Windy at times.
Evening Temperature: 74°F
Mostly clear with showers likely. Slight chance of a thunderstorm. Windy at times.
Friday, May 29th, 2026
Overnight Temperature: 69°F
Clear with cloudy periods with a chance of showers. Slight chance of a thunderstorm.
Morning Temperature: 73°F
A mix of sun and cloud with a slight chance of showers or thundershowers.
Afternoon Temperature: 83°F
A mix of sun and cloud. Chance of a thunderstorm. Windy at times.
Evening Temperature: 75°F
A mix of cloudy and clear skies. Chance of a thunderstorm. Windy at times.





 

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This WeatherCity Weather Forecast for Decatur, Illinois, United States is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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